INCOME TAXES - Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Current income tax provision	$ 21,721	$ (8,763)	$ 13,723
Deferred income tax expense (benefit)	5,243	8,361	(3,409)
Total income tax provision	$ 26,964	$ (402)	$ 10,314